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Roger Federer will be out of action for up to a month after undergoing
arthroscopic knee surgery in Switzerland to repair a torn meniscus, his
agent Tony Godsick has confirmed on Wednesday.

The 17-times grand slam champion sustained the injury the day after his semi-final loss to Novak Djokovic in the semi-finals of the Australian Open.

In a media release Federer said that he would be forced to withdraw from
two upcoming ATP World Tour 500 events, the ABN AMRO World Tennis
Tournament in Rotterdam and the Dubai Duty Free Tennis championships in
Dubai.

"I am so
disappointed to have to miss Rotterdam and Dubai as they are two of my
favourite tournaments on the ATP World Tour," said Federer, who is the
reigning champion in Dubai having won the title for the seventh time
last March.

"While this is an unfortunate setback, I feel grateful that up until now
I have remained mostly healthy throughout my career," the 34-year-old
Swiss added.

"My doctors have ensured me that the surgery was a success and with
proper rehabilitation, I will be able to return to the Tour soon."

The world number three has won two Rotterdam trophies among his 88 titles.

Federer has rarely missed any tournaments for health reasons during his remarkable 18-year professional career.

In 2005 he was out of action for six weeks while he
recovered from foot injury and during 2008 and 2013 he was troubled by a bout of
mononucleosis and back problems.

Federer had been expected to leapfrog British world number
two Andy Murray in the ATP standings in February while expectant father
Murray takes a paternity break from the game.

However, Federer's injury setback ended those hopes and
the Swiss is expected to make his comeback at the Indian Wells Masters
in March.